Prestressed Concrete Box Girder with High-Capacity Strands-Monitoring and Analysis during Fabrication
نویسندگان
چکیده
Despite the attractive merits of high-capacity strands, application in bridge girders is limited due to concerns, including concrete cracking, excessive stress, and cambers. An efficient defect-free production first step wide application. The objective this research was alleviate concerns prestressed using strands. A gigantic box girder 18-mm strands produced; its entire fabrication process (from strand stressing detension) introduced. Sixteen temperature gauges were embedded monitor hydration large volume adjacent environmental temperature. Moreover, displacement transducers used measure camber at detension; load cells installed variations prestressing tensile forces during fabrication. Monitoring analysis showed that timing detension determined by concrete, compressive strength modulus elasticity or age. Since are affected concrete’s internal temperature, conducted after falls back (close initial value); otherwise, unfavorable considerable prestress losses caused. Finally, a 4-d suggested since not concern time; predicted loss acceptable material properties 4 d satisfied requirements.
منابع مشابه
Prestressed Concrete Girder Bridges Using Large 0.7 Inch Strands
The National Bridge Inventory (NBI) includes more than 600,000 bridges within the United States of Prestressed concrete girder bridges represent one of the most widely used bridge systems. The majority of these girder bridges were constructed using 0.5 and 0.6 inch diameter strands. The main impediments to using larger strand diameters are: 1) bed capacities, 2) lack of structural knowledge reg...
متن کاملOptimization of Precast Prestressed Concrete Bridge Girder Systems
60 A practical approach to the optimal design of precast, prestressed concrete highway bridge girder systems is presented. The approach aims at standardizing the optimal design of bridge systems, as opposed to standardizing girder sections. Structural system optimization is shown to be more relevant than conventional girder optimization for an arbitrarily chosen structural system. Bridge system...
متن کاملBehavior of Prestressed Concrete Beams with CFRP Strands
................................................................................................................................. i Dedication........................................................................................................................... iii Acknowledgements............................................................................................................. i...
متن کاملStrengthening of Impacted Prestressed Concrete Bridge I-Girder Using Prestressed Near Surface Mounted C-FRP Bars
متن کامل
Torsional Analysis for Prestressed Concrete Multiple Cell Box
The Softened Truss Model Theory applied to a prestressed concrete multiple cell box is developed in this study. In this theory, the concrete torsional problem is solved by combining equilibrium conditions, compatibility conditions and constitutive laws of materials. Up to now the theory has been applied only to the case of pure torsion with single cell section. An algorithm is presented to deal...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Buildings
سال: 2022
ISSN: ['2075-5309']
DOI: https://doi.org/10.3390/buildings12070911